Buy API 11BR: RECOMMENDED PRACTICE FOR THE CARE AND HANDLING OF SUCKER RODS from SAI Global. Find the most up-to-date version of API RP 11BR at Engineering Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at  API RP 11BR, Recommended Practice for Care and Handling of Sucker.
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Corrosion pits are one type of stress raiser. Thus, while the SM couplings help to increase rod-string life, the tubing life may be decreased.
The first column of Table I in this reference contains the rod-string size designation. Old pony rods normally should not be used in the load-carrying part of a new rod strings. Despite having high strength and a small cross-sectional area, it was expensive and ran into field support problems similar to those of flexible strands and CORODs.
Friction in the pump holddown plus sediments in the pump-tubing annulus increases the required pump-unseating force. However, typically only one grade of rod is used in the string to avoid mixing during running and pulling operations.
Makeup the connection to the hand-tight position. The fine-grain heat treatment done on these alloys theoretically should provide increased fatigue life. Class T through hardened coupling has a Rockwell C hardness range of minimum 16 and maximum 23, and Class SM surface hardened has a minimum Rockwell C surface hardness of Maximum compression -5 ksi 3. Worksheet 36 – Thermal Processes Review.
This hardness is normally accomplished by the spray-metal process. However, continued work suggested adopting a “modified-stress” approach in which aip stress xpi the dynamic loads at the top of each size of rod is equalized.
The 11gr is a summary of the normal rod-string equipment and typical reasons for failure:. Thus, they could be used in a hydrogen sulfide H 2 S environment in which the strength of Grade C rods is exceeded. The manufacturer of specialty or non-API rods should be consulted for their recommended CD values and makeup procedures.
However, a high tubing-casing-annulus fluid level decreases the load on the rod string when attempting to unseat a pump. Normally, the pulling-rig weight indicators are not accurate enough to use as the only tool to prohibit yielding the sucker rods. It is important to keep the following in mind when screening a well for FRP-rod use:.
Where the yield strength of a rod string is necessary in calculations, it is recommended that if the manufacturer is not known, a minimum yield of 60, psi for Grade C and K and ofpsi for Grade D should be used. This is especially problematic if field welds are made and the rods are used in an inadequately protected corrosive environment.
Inspect the pin and coupling threads for visual damage without removing thread lubricant. The tensile strength is generally greater thanpsi, while the yield strength is generally greater thanpsi; therefore, these rods could not be classified as API Grade D.
RP 11BR Archives – Production Technology
The top apl in the bottom section normally has the highest stress in the string because it has the smallest cross-sectional area. A hand-tight position is attained when full shoulder abutment is made and a 11b. The taper percentages published in RP 11L were calculated from the Neely,  procedure by assuming several parameters like pumping speed, polished rod stroke length, etc.
They are under stress on both the downstroke and the upstroke.
Subsurface equipment for sucker-rod lift. Completely disassemble the connection. This overtravel approximately equals twice the expected value when using steel sucker-rod strings. They also are standardized in size and performance by API Spec. Sucker-rod strings may be composed of a single size or may be tapered, typically to include rods of two and three sizes.
Columns 6 through 11 in Table D. This is impractical, not only because of the manufacturing difficulties involved, but also because the lower rods must have sufficient stiffness to support the entire string in the tubing if failures occur high up in the string.
API RP 11BR Revisions on Sucker Rod Makeup
Sucker rods are a key component of a sucker-rod lift type of artificial lift system. The proper design will decrease the stress on the rods above the bottom section. A number of manufacturers have developed higher-strength steel rods to compete with other specialty rods. Corrosion pits may have rounded or notched shape; notch-shaped pits are more serious 1br are more likely to occur in Grade D rods than in Grade C rods.
In a noncorrosive environment, the endurance limit of steel is primarily determined 11b the maximum stress, the range of stresses, and the number of stress reversals. Thus, slimhole couplings are not as strong as the full size. Rod strings should be designed to enable the operator to unseat the pump without yielding any rod in the rod string.